Regarding Freight Charges and Discounts in Depo Excise Invoice

Hi All,

I got a requirement from my client for the customization of depo excise invoice in his own format in this invoice i got fields like Freight charges and Dscounts and now i want to know from which table system had to pick these charges if it is normal invoice we can take it by using condition recor number but in a Excise invoice how it shoud be picked and what is the technical information i have to share with abaper for DISCOUNTS and FREIGHT CHARGES to get display in EXCISE INVOICE.